Comment 3 for bug 1873091

We discussed that RFE on our last drivers meeting http://eavesdrop.openstack.org/meetings/neutron_drivers/2020/neutron_drivers.2020-05-08-14.00.log.html#l-55

We decided to approve this RFE as there are valid usecases and need to clean a bit mess with this dns integration.

As a next step we will need spec with detailed description of current situation (like what dns_domain options are used for what :)) so we can develop some good solution which will work for new use cases and will be somehow backward compatible.